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Journal articles on the topic 'Supra-molecular Framework'

Author: Grafiati

Published: 7 September 2023

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1

Arletti, Rossella, Simona Quartieri, Giovanna Vezzalini, Ettore Fois, and Gloria Tabacchi. "HP-induced supra-molecular organization of guest molecules in FER-type zeolites." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1469. http://dx.doi.org/10.1107/s2053273314085301.

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The response to pressure of a synthetic all-silica ferrierite (Si-FER) and of a natural ferrierite from Monastir (Sardinia, Italy) (Mon-FER, Na0.56 K1.19 Mg2.02 Ca0.52 Sr0.14)(Al6.89Si29.04)O72 ·17.86 H2O) is here investigated combining HP synchrotron XRPD experiments and molecular dynamics simulations. The experiments were carried out by using penetrating (methanol:ethanol:water 16:3:1, m.e.w.; ethanol:water 1:3, e.w.) and non-penetrating (silicone oil, s.o.) pressure transmitting media (PTM). In Si-FER compressed in e.w., both water (w.) and ethanol molecules (e.) enter the pore system even

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2

Yan, Li, Wei Liu, Chuanbi Li, Yifei Wang, Li Ma, and Qinqin Dong. "Hydrogen bonded supra-molecular framework in inorganic–organic hybrid compounds: Syntheses, structures, and photoluminescent properties." Journal of Molecular Structure 1035 (March 2013): 240–46. http://dx.doi.org/10.1016/j.molstruc.2012.11.046.

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3

FENG, ZHAO-QING, and GEN-MING JIN. "PROBING THE SYMMETRY ENERGY AT SUPRA-SATURATION DENSITIES FROM PION EMISSION IN HEAVY-ION COLLISIONS." International Journal of Modern Physics E 19, no. 08n09 (2010): 1686–93. http://dx.doi.org/10.1142/s0218301310016107.

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Within the framework of the improved isospin dependent quantum molecular dynamics (ImIQMD) model, the emission of pion in heavy-ion collisions in the region 1 A GeV as a probe of nuclear symmetry energy at supra-saturation densities is investigated systematically, in which the pion is considered to be mainly produced by the decay of resonances Δ(1232) and N *(1440). The π-/π+ yields are calculated for selected Skyrme parameters SkP, SLy6, Ska and SIII, and also for the cases of different stiffness of symmetry energy with the parameter SLy6. Preliminary results compared with the measured data b

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4

Yan, Li, Chuanbi Li, and Xiaoli Chen. "Hydrogen bonded supra-molecular framework in inorganic–organic hybrid compounds of Mn(II) and Zn(II): Syntheses, structures, and photoluminescent studies." Journal of Molecular Structure 1058 (January 2014): 277–83. http://dx.doi.org/10.1016/j.molstruc.2013.11.026.

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5

Shi, Shikao, Ji Zhou, Shitian Han, Yanli Peng, and Jianping Ye. "Optical Properties of Porphyrin Chromophores Assembled in Nano-Lamellar Zirconium Phosphate." Journal of Nanoscience and Nanotechnology 8, no. 3 (2008): 1359–63. http://dx.doi.org/10.1166/jnn.2008.18196.

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The supra-molecular assemblies and optical properties of the symmetrical neutral porphyrin chromophore, meso-tetra(4-pyridyl)porphine, bound to a modified α-zirconium phosphate framework have been studied. The interlayer distance of the cetyltrimethylammonium zirconium phosphate framework is 39.6 Å. After the addition of meso-tetra(4-pyridyl)porphine to the framework, the X-ray powder diffraction (XRPD) patterns show that the interlayer distance of the framework is 30.3 Å, demonstrating the formation of novel assemblies. In the framework, organic chromophores are assumed to align in a canted m

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6

Kawamura, Yasuhiko, Takaaki Ishiduka, and Masao Tsukayama. "One-Way Geometrical Isomerization of 1,1-Diarylethenes Induced by Photosensitized Electron Transfer." International Journal of Modern Physics B 17, no. 08n09 (2003): 1492–97. http://dx.doi.org/10.1142/s0217979203019216.

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One-way geometrical isomerization around a C=C bond of 1,1-diary1-2-t-butylethene is achieved upon photoirradiation of cyanoaromatics as a light-absorbing sensitizer. In the thermochemical view, there is no difference between both E and Z isomers of the ethene. Key intermediate is a putative distonic radical cation which is a unique one having a spatially separate radical and ionic centers on the molecular framework. Generation of such an intermediate is due to the presence of a π-donating substituent on an aromatic ring and a bulky t-butyl group. Molecular oxygen interacts as superoxide with

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7

Kawamura, Yasuhiko, Takahiro Abe, and Masao Tsukayama. "One-Way and Two-Way Geometrical Isomerizations of 1, 1-Diarylketone Oxime O-Methyl Ethers Induced by Photosensitized Electron Transfer." International Journal of Modern Physics B 17, no. 08n09 (2003): 1487–91. http://dx.doi.org/10.1142/s0217979203019204.

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Under an oxygen atmosphere, the E and Z isomer ratio of N-methoxy-4-methoxyphenyl-4'-methylphenylmethanimine (one of the title compounds; initially, ⌈E⌉/⌈Z⌉ = 1/1) reached to 4/96 upon irradiation (> 360 nm) of 9, 10-dicyanoanthracene (DCA) as a photosensitizer in acetonitrile. Key intermediate is presumed to be a putative distonic radical cation which is a unique one having a spatially separate radical and ionic centers on the molecular framework. The whole scenario of the reaction was supported by molecular orbital calculations. An excited singlet state of DCA generated by light absorptio

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8

Altayyar, Mansour, Jennifer A. Nasser, Dimitra Thomopoulos, and Michael Bruneau. "The Implication of Physiological Ketosis on The Cognitive Brain: A Narrative Review." Nutrients 14, no. 3 (2022): 513. http://dx.doi.org/10.3390/nu14030513.

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Optimal cognitive functions are necessary for activities of daily living and self-independence. Cognitive abilities are acquired during early childhood as part of progressive neurodevelopmental milestones; unfortunately, regressive changes can occur as part of physiological aging, or more ominously, pathological diseases, such as Alzheimer’s disease (AD). Cases of AD and its milder subset, mild cognitive impairment (MCI), are rising and would impose a burdensome impact beyond the individual level. Various dietary and nutritional approaches have potential for promising results in managing cogni

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9

Porto, Michele, Paolino Caputo, Valeria Loise, Giovanni De Filpo, Cesare Oliviero Rossi, and Pietro Calandra. "Polysaccharides-Reinforced Bitumens: Specificities and Universality of Rheological Behavior." Applied Sciences 9, no. 24 (2019): 5564. http://dx.doi.org/10.3390/app9245564.

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The rheological properties of bitumens can be modified by the addition of specific chemical additives. Taking into account the molecular complex aggregation pattern, we hypothesized that macromolecules characterized by long, flexible, and hydrophilic chains can establish soft bridges connecting the different polar aggregates of asphaltenes, strengthening their overall hierarchical supra-structures, and consequently increasing rheological performance at higher temperatures. Here, we propose the use of low cost and high availability polysaccharides as chemical additives to improve the rheologica

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10

Lloyd, David, Miguel A. Aon, and Sonia Cortassa. "Why Homeodynamics, Not Homeostasis?" Scientific World JOURNAL 1 (2001): 133–45. http://dx.doi.org/10.1100/tsw.2001.20.

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Ideas of homeostasis derive from the concept of the organism as an open system. These ideas can be traced back to Heraclitus. Hopkins, Bernard, Hill, Cannon, Weiner and von Bertalanffy developed further the mechanistic basis of turnover of biological components, and Schoenheimer and Rittenberg were pioneers of experimental approaches to the problems of measuring pool sizes and dynamic fluxes. From the second half of the twentieth century, a biophysical theory mainly founded on self-organisation and Dynamic Systems Theory allowed us to approach the quantitative and qualitative analysis of the o

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11

Bene, László, Miklós Bagdány, and László Damjanovich. "T-cell Receptor Is a Threshold Detector: Sub- and Supra-Threshold Stochastic Resonance in TCR-MHC Clusters on the Cell Surface." Entropy 24, no. 3 (2022): 389. http://dx.doi.org/10.3390/e24030389.

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Stochastic resonance in clusters of major histocompatibility molecules is extended by a more detailed description of adaptive thresholding and by applying the notion of suprathreshold stochastic resonance as a stochastically quantizing encoder of transmembrane signaling downstream of major histocompatibility molecules and T-cell receptors on the side of presenting and recognizing cells, respectively. The adaptive nature of thresholding is partly explained by a mirroring of the noncognate–cognate dichotomy shown by the T-cell receptor structure and the kinetic-segregation model of the onset of

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12

Lalwani, Poortata, and David Brang. "Stochastic resonance model of synaesthesia." Philosophical Transactions of the Royal Society B: Biological Sciences 374, no. 1787 (2019): 20190029. http://dx.doi.org/10.1098/rstb.2019.0029.

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In synaesthesia, stimulation of one sensory modality evokes additional experiences in another modality (e.g. sounds evoking colours). Along with these cross-sensory experiences, there are several cognitive and perceptual differences between synaesthetes and non-synaesthetes. For example, synaesthetes demonstrate enhanced imagery, increased cortical excitability and greater perceptual sensitivity in the concurrent modality. Previous models suggest that synaesthesia results from increased connectivity between corresponding sensory regions or disinhibited feedback from higher cortical areas. Whil

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13

Javaid, Zainab, Usman Rashid, Sarmad Saif, et al. "Honey as a Medium of Non-Surgical Periodontal Therapy." Pakistan Journal of Medical and Health Sciences 16, no. 5 (2022): 1597–601. http://dx.doi.org/10.53350/pjmhs221651597.

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Gingivitis is an infection caused by plaque and calculus accumulation. Gingivitis if not treated progress to periodontitis, a more advanced form of gum disease. Periodontal disease was the world's 11th most frequent disease in 2016 according to the World Health Organization. Surgical as well non- surgical periodontal therapies are carried out for periodontal disease treatment. Debridement of supra-gingival and sub-gingival calculus, along with instructions about oral health care methods are the basis of traditional non-surgical periodontal therapy (NTPS). Honey is beneficial to oral health, pa

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14

Mallet, Robert T., Albert H. Olivencia-Yurvati, and Rolf Bünger. "Pyruvate enhancement of cardiac performance: Cellular mechanisms and clinical application." Experimental Biology and Medicine 243, no. 2 (2017): 198–210. http://dx.doi.org/10.1177/1535370217743919.

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Cardiac contractile function is adenosine-5'-triphosphate (ATP)-intensive, and the myocardium’s high demand for oxygen and energy substrates leaves it acutely vulnerable to interruptions in its blood supply. The myriad cardioprotective properties of the natural intermediary metabolite pyruvate make it a potentially powerful intervention against the complex injury cascade ignited by myocardial ischemia–reperfusion. A readily oxidized metabolic substrate, pyruvate augments myocardial free energy of ATP hydrolysis to a greater extent than the physiological fuels glucose, lactate and fatty acids,

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15

Grawunder, Sven, Natalie Uomini, Liran Samuni, et al. "Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage." Philosophical Transactions of the Royal Society B: Biological Sciences 377, no. 1841 (2021). http://dx.doi.org/10.1098/rstb.2020.0455.

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The origins of human speech are obscure; it is still unclear what aspects are unique to our species or shared with our evolutionary cousins, in part due to a lack of a common framework for comparison. We asked what chimpanzee and human vocal production acoustics have in common. We examined visible supra-laryngeal articulators of four major chimpanzee vocalizations (hoos, grunts, barks, screams) and their associated acoustic structures, using techniques from human phonetic and animal communication analysis. Data were collected from wild adult chimpanzees, Taï National Park, Ivory Coast. Both di

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16

Barten, Robin, Dirk-Jan M. van Workum, Emma de Bakker, et al. "Genetic mechanisms underlying increased microalgal thermotolerance, maximal growth rate, and yield on light following adaptive laboratory evolution." BMC Biology 20, no. 1 (2022). http://dx.doi.org/10.1186/s12915-022-01431-y.

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Abstract Background Adaptive laboratory evolution (ALE) is a powerful method for strain optimization towards abiotic stress factors and for identifying adaptation mechanisms. In this study, the green microalga Picochlorum sp. BPE23 was cultured under supra-optimal temperature to force genetic adaptation. The robustness and adaptive capacity of Picochlorum strains turned them into an emerging model for evolutionary studies on abiotic stressors such as temperature, salinity, and light. Results Mutant strains showed an expanded maximal growth temperature of 44.6 °C, whereas the maximal growth tem

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17

Hans, Jörg B., Niels Pfennigwerth, Bernd Neumann, et al. "Molecular surveillance reveals the emergence and dissemination of NDM-5-producing Escherichia coli high-risk clones in Germany, 2013 to 2019." Eurosurveillance 28, no. 10 (2023). http://dx.doi.org/10.2807/1560-7917.es.2023.28.10.2200509.

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Background Carbapenemase-producing Enterobacterales (CPE) are rapidly increasing worldwide, also in Europe. Although prevalence of CPE in Germany is comparatively low, the National Reference Centre for Multidrug-resistant Gram-negative Bacteria noted annually increasing numbers of NDM-5-producing Escherichia coli isolates. Aim As part of our ongoing surveillance programme, we characterised NDM-5-producing E. coli isolates received between 2013 and 2019 using whole genome sequencing (WGS). Methods From 329 identified NDM-5-producing E. coli, 224 isolates from known geographical locations were s

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